commercialhvacuk
Get a Quote

Asbestos in old HVAC plant and ductwork: what to check first

Updated 23 October 2026 · SEO Dons Editorial

Where can asbestos turn up in older HVAC installations?

HSE says "Asbestos can be found in any industrial or residential building built or refurbished before the year 2000", and that it can be "visible or hidden within the building fabric". These are the heating, ventilation and cooling items its guidance names. The sources here are HSE and Great Britain legislation. Northern Ireland has its own arrangements, which this page does not cover.

ItemWhat HSE saysWho may work on it
Lagging on pipes, boilers and calorifiers"mostly found in or on heating systems"; residues "may also be found on brickwork and in ducts"Most work needs an HSE licensed contractor
Cement flues and ducts"sometimes found in boiler systems (including domestic), air conditioning and ventilation systems"Trained non-licensed workers; replacement has an HSE task sheet
Gaskets and rope sealsUsed "for sealing pipe and valve joints in industrial plant"Non-licensed if removed intact; notifiable if broken up
Flexible duct connectors (gaiters)Covered by an Asbestos essentials task sheetNon-licensed task sheet exists
Insulating board in bulkheads, panels and ceiling tilesUsed for fire protection in "internal partition walls and bulkheads above ceilings"Most removal needs a licensed contractor
Sprayed coatingsFire protection on steel, concrete beams and the underside of floorsAll work needs a licensed contractor

HSE also names old equipment as a place to look, including gaskets, electrical switchgear and heat resistant panels. The category depends on the material, its condition and the method, so the surveyor decides, not the table.

Who holds the duty, and what must happen before work starts?

Regulation 4 of the Control of Asbestos Regulations 2012 defines the dutyholder as "every person who has, by virtue of a contract or tenancy, an obligation of any extent in relation to the maintenance or repair of non-domestic premises", or who controls the premises. That may be a landlord, a tenant or both, so the lease matters. The dutyholder must have a suitable and sufficient assessment and a written plan, and ensure information on location and condition is "provided to every person liable to disturb it".

The contractor has its own duty. Regulation 5 says an employer "must not undertake work in demolition, maintenance or any other work which exposes or is liable to expose employees of that employer to asbestos in respect of any premises" unless it has assessed the position or "assumes that asbestos is present, and that it is not chrysotile alone". HSE lists "heating and ventilation engineers" among installers who must be told, and says to provide the information "as early as possible, for example when you ask for a quote for the job".

What is the difference between the register and a refurbishment survey?

The asbestos register "is a live document which must always contain current information on the presence and condition of asbestos-containing materials (ACMs)". It comes from a management survey, which covers areas such as "above false ceilings (ceiling voids), lofts, inside risers, service ducts and lift shafts". Areas not inspected "must be presumed to contain ACMs".

Replacing plant needs a refurbishment survey, the second type. HSE says installation or refurbishment work that disturbs hidden asbestos "will require a more intrusive survey to be completed before work can start". A refurbishment or demolition survey must find ACMs "before any structural work begins at the premises or on equipment", involves "destructive inspection", and needs the area vacated. HSE's guide is HSG264, and HSE says UKAS is "currently the sole recognised accreditation body in Great Britain for asbestos inspection bodies carrying out surveys".

Nobody on the project should sample, cut or break up suspect material to find out. HSE says "The only way to confirm if a suspect material contains asbestos fibres is to obtain and analyse a sample of it", and that sampling "should be carried out by a suitably trained person".

What is the practical order of work for a replacement?

  1. Find the dutyholder and obtain the register and management plan.
  2. Check the register against the scope: plant rooms, risers, ceiling voids, flues, duct connectors, lagging and roof penetrations. Uninspected areas are presumed to contain ACMs, and HSE says they must be surveyed before work.
  3. Give the register to tenderers at quote stage.
  4. Commission a refurbishment survey from a competent surveyor, before any intrusive work.
  5. Update the register and agree with the surveyor which work is licensed, notifiable or non-licensed.
  6. Appoint a licensed contractor where required. HSE notes "a 14-day notification period before work can begin", and licensed work "needs careful planning", so build it into the programme.
  7. Appoint an independent analyst for clearance. HSE recommends the analyst be "independently sourced and employed by the building owner or building client".
  8. Handle waste and old plant properly. HSE says equipment that may contain asbestos "must be transported with a consignment note to a permitted asbestos waste facility", and that you "should not buy or sell equipment that contains asbestos".
  9. Strip out and fit the new plant, then update the register and keep the records.

The wider project sequence is in retrofitting air conditioning into an existing office and commissioning and handover. Plant replacement itself is in the air conditioning replacement guide.

Which category of work applies?

CategoryHSE examplesRequirement
Licensed"any work on sprayed asbestos"; "most repair or any removal of asbestos insulation, for example lagging on pipes and vessels"; "most work on asbestos insulating boards"The employer must hold a licence, and notify the enforcing authority at least 14 days before
Notifiable non-licensedGaskets or seals "substantially broken up or damaged during removal"Notify, designate the area, arrange medical examinations, keep health records
Non-licensedRemoving gaskets that stay "virtually intact"; HSE task sheets for gaiters and cement fluesTrained workers and appropriate controls

HSE's Asbestos essentials also includes a sheet on what to do if asbestos is discovered or accidentally disturbed during work. A permit-to-work system, HSE says, "can help ensure" that only trained people work on asbestos. Readers can send an enquiry through the site's form.

Sources

Common questions

Does a building completed after 2000 need an asbestos check before HVAC work?

HSE says asbestos is unlikely in a building constructed after 2000, but to think about old industrial machinery or equipment. A refurbished older building is different, because HSE says to assume asbestos in anything built or refurbished before 2000. The register shows which applies.

Who is the dutyholder if the building is leased?

Regulation 4 includes anyone with a contract or tenancy obligation to maintain or repair the premises, or anyone who controls them. Where there is more than one, the share of the duty follows the maintenance or repair obligation each holds. Check the lease and ask for the register.

Can an HVAC contractor take a sample to check a suspect material?

HSE says sampling should be carried out by a suitably trained person, and that if in doubt a competent surveyor should be used. Analysis must be done by trained and accredited analysts. Staff and contractors who suspect asbestos should leave testing to the surveyor and the accredited laboratory.

Can asbestos be left in place during a replacement?

HSE says asbestos in good condition can be left in place if it is in the register and checked regularly. But if it is likely to be disturbed it should be protected or removed, so in practice the work scope decides. The survey and the licensing rules set the route.

Ask for commercial HVAC quotes

SEO Dons Ltd publishes this site and replies to every enquiry by email. It does not install, service or maintain HVAC.

Get a quote
Get a quote